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Great Mazinger resembles its predecessor but has a few minor changes such as a larger height and weight, a higher crown, horns that are pointed upwards on the sides of its head, a V-shaped heat sink, and pointed fins on its appendages. It features a built-in, compact red Scrander called the Scramble Dash on its back that can expand and allow flight anywhere.

Dr. Kenzo Kabuto knew of the threat to come with the death of Dr. Hell and using his father's designs of the Mazinger Z, Kenzo improved upon them adding more features and refining Super Alloy Z to a stronger and lighter alloy, Super Alloy New Z. He took in two orphans to train in using the robots he created to fight the Mycenae Empire. Tetsuya completed his training in time to help Kenzo's biological son, Koji Kabuto and the Mazinger Z when the Mycenae started their attack.

With the Mazinger and Diana A badly damaged, Koji and Sayaka Yumi travel to America to study leaving Japan's safety in Tetsuya and his partner Jun Hono's hands. With the Great Mazinger, Tetsuya battled against the Empire's Warrior Beasts and their generals before facing off against the Great General of Darkness in a great and exhausting battle. The Great Mazinger emerged victorious. But the threat was far from over.

With the Great General's death, the Emperor of Darkness had him replaced with a revived Dr. Hell now known as Great Marshall of Hell. By attacking two cities at times in order to lure the Great and Venus far away from each other, Hell attacked and decimated the now unguarded Science Fortress Laboratory and nearly destroyed it. Just in time, a repaired and upgraded Mazinger Z arrived piloted by a returned Koji Kabuto, who is able to protect the Science Fortress long enough for the Great to come back. In the manga version, Hell only tried to capture the Great which ended in failure.

The Great Marshall attacked again on two fronts, this time on the Photon Power Laboratory. Although its power plant remained, the rest of the lab was destroyed. Meanwhile the Great Mazinger suffered serious internal damages and Tetsuya himself was injured. The Mazingers were unable to save Dr. Kabuto as he sacrificed himself to cripple the impending enemies. Koji and Tetsuya were both saddened with the death of their father and launched a final assault to finish off the badly damaged Fortress Demonika. With help from Diana A and Venus A, the Double Mazingers dealt the finishing blow to Great Marshall Hell.

With the Mycenae Empire's defeat, the Great Mazinger and Mazinger Z were put in storage until they were brought out to fight the Grendizer in the manga. In the anime, it's implied that both Mazingers are on display in a museum.

An airplane-like scrander that functions like the Mazinger Z's Jet Scrander and launched from the Science Fortress Laboratory. When combined with the Great Mazinger, the Great Booster greatly improves the robot flight capabilities (even though the Great could already fly through its built-in Scrander) and can be shot at the enemies with powerful force, usually destroying them at impact.

Navel MissileJust like Mazinger Z, Great Mazinger mounts a missile launcher in its stomach.

Atomic PunchGreat Mazinger also possesses a Rocket Punch-like attack, though its fists spin while in flight, giving them extra force.

Drill Pressure PunchIt is like the Atomic Punch, except that the forearms sprout drill-like blades that add to the damage as well as the speed of rotation.

Great BoomerangGreat Mazinger can take the heat sink fin off of its chest and throw it as a giant boomerang.

Scramble CutterJust like Mazinger Z's Scrander Cutter, Great Mazinger slashes the enemy with the Scrander's wings while flying at high speeds.

Great TyphoonJust like Mazinger Z, Great Mazinger uses turbines to generate powerful wind attacks. However, Great Mazinger's attack is simply a wind-based attack, lacking the corrosive properties of Mazinger's attack.

Knee Impulse KickGreat Mazinger can sprout a spike from its knee, making its kick attacks more lethal.

Backspin KickGreat Mazinger can also sprout a curved blade on the front of its leg for stronger kicks.

Mazinger BladeThe flanged compartments on Great Mazinger's legs hold a pair of swords. Tetsuya typically uses the Blades for melee combat, but on several occasions he threw them at the enemy.

Photon Beam (Devilman vs Hades Only)

Breast BurnLike Mazinger Z, the fin on Great Mazinger's chest doubles as a heat sink and a weapon, unleashing incredible thermal energy.

Thunder BreakGreat Mazinger can release energy into the atmosphere, stimulating the process that creates natural lightning. Great Mazinger then calls the lightning down onto the antennae on its head and redirects the energy towards an enemy.

Thunder BladeA one-time attack where Tetsuya channeled the lightning from the Thunder Break through one of his Mazinger Blades.

Double Thunder BreakSimilar to Thunder Break but Great Mazinger uses both hands to redirect the lightning.

Breast Burn SpecialBasically a powered-up Breast Burn, almost akin to the Kaiser Nova of Mazinkaiser but with detrimental effects to Great Mazinger. Used in the manga to destroy Gilgilgan from within.